Replace the full socket path name, not just a directory component. bug#14720


mysql-test/r/connect.result:
  In cases where "--tmpdir=" is given to the test run, the socket file is not created below
  "$MYSQL_TEST_DIR" but rather within this directory. So the "--replace_result" should not 
  be done to a directory in the path but rather to the complete path name of the socket file. 
  bug#14720
mysql-test/t/connect.test:
  In cases where "--tmpdir=" is given to the test run, the socket file is not created below
  "$MYSQL_TEST_DIR" but rather within this directory. So the "--replace_result" should not
  be done to a directory in the path but rather to the complete path name of the socket file.
  bug#14720